Page 24: of Maritime Reporter Magazine (September 2013)

EYE ON DESIGNModeling of ThrustersEfforts continue to improve the MARIN uses thrusters in many projects. For a typical model scale, around 1:50 to 1:60, relatively small thrusters are required. Thrusters for these models are available ranging from 50 mm to 80 mm nozzle diameters. In the past these thrusters were always modelled with a hori-zontal shaft.By tilting the nozzle, the closest possible match was achieved between the client speciÞ cations and the mod- elled thruster for the basin tests.Due to the ever-evolving process in improving the models, new thrusters were built witha 7-degree tilted thruster shaft. Special gears were made for a reliable and durable thruster model and with these new thrusters it is still pos-sible to mount nozzles with a slightly different angle. See Þ gures for examples. The newly built thrusters give clients the ability to choose a more accurate representation of the thrusters used during model testing.Robert Heerkink is project manager at the Ships department of MARIN, the Maritime Research Institute Netherlands. MARIN offers simulation, model testing, full-scale measure- ments and training programs, to the shipbuild- ing and offshore industry and governments. E: [email protected] www.marin.nl 0 deg. tilted nozzle5 deg. tilted nozzle7 deg. tilted nozzle7 deg. tilted axis, 5 deg. tilted nozzle7 deg. tilted axis, 7 deg. tilted nozzleModel with mounted thrusters24 Maritime Reporter & Engineering News ? SEPTEMBER 2013 MR #9 (18-25).indd 24MR #9 (18-25).indd 249/3/2013 9:17:29 AM9/3/2013 9:17:29 AM